#region License

// TweetSharp
// Copyright (c) 2010 Daniel Crenna and Jason Diller
// 
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

#endregion

using System;
using Newtonsoft.Json;

namespace TweetSharp.Model.Converters
{
    /// <summary>
    /// Acts as a base for custom JSON conversion.
    /// </summary>
    public abstract class TweetSharpConverterBase : JsonConverter
    {
        /// <summary>
        /// Determines whether the specified type is nullable.
        /// </summary>
        /// <param name="type">The type.</param>
        /// <returns>
        /// 	<c>true</c> if the specified t is nullable; otherwise, <c>false</c>.
        /// </returns>
        public static bool IsNullable(Type type)
        {
            return type != null && (!type.IsValueType || IsNullableType(type));
        }

        /// <summary>
        /// Determines whether [is nullable type] [the specified t].
        /// </summary>
        /// <param name="type">The t.</param>
        /// <returns>
        /// 	<c>true</c> if [is nullable type] [the specified t]; otherwise, <c>false</c>.
        /// </returns>
        public static bool IsNullableType(Type type)
        {
            if (type == null)
            {
                return false;
            }

            return (type.IsGenericType &&
                    type.GetGenericTypeDefinition() == typeof (Nullable<>));
        }
    }
}